#ifndef _SPN_H
#define _SPN_H

unsigned char do_perm(unsigned char w, unsigned char perm[16]);
unsigned char do_subst(unsigned char w, unsigned char subst[16]);

unsigned short encrypt(
    unsigned short w,
    unsigned int key,
    unsigned char perm[16],
    unsigned char subst[16]
);

unsigned short decrypt(
    unsigned short w,
    unsigned int key,
    unsigned char perm[16],
    unsigned char subst[16]
);

#endif